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Li B, Wang YL. Self-Assembly of Miktoarm Star Polyelectrolytes in Solutions with Various Ionic Strengths. ACS OMEGA 2022; 7:20791-20799. [PMID: 35755333 PMCID: PMC9219065 DOI: 10.1021/acsomega.2c01317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 05/30/2022] [Indexed: 06/15/2023]
Abstract
We studied the self-assembly of miktoarm star polyelectrolytes with different numbers of arms in solutions with various ionic strengths using coarse-grained molecular dynamic simulations. Spherical micelles are obtained for star polyelectrolytes with fewer arms, whereas wormlike clusters are obtained for star polyelectrolytes with more arms at a low ionic strength environment, with hydrophilic arms showing a stretched conformation. The number of clusters shows an overall decreasing tendency with increasing the number of arms in star polyelectrolytes due to strong electrostatic coupling between polycations and polyanions. The formation of wormlike clusters follows an overall stepwise pathway with an intermittent association-dissociation process for star polyelectrolytes with weak electrostatic coupling. These computational results can provide relevant physical insights to understand the self-assembly mechanism of star polyelectrolytes in solvents with various ionic strengths and to design star polyelectrolytes with functional groups that can fine-tune self-assembled structures for specific applications.
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Affiliation(s)
- Bin Li
- School
of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China
| | - Yong-Lei Wang
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
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2
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Behavior of Na+-Polystyrene Sulfonate at the Interface with Single-Walled Carbon Nanotubes (SWNTs) and Its Implication to SWNT Suspension Stability. Polymers (Basel) 2011. [DOI: 10.3390/polym3020942] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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3
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Chen L, Merlitz H, He SZ, Wu CX, Sommer JU. Polyelectrolyte Brushes: Debye Approximation and Mean-Field Theory. Macromolecules 2011. [DOI: 10.1021/ma1024413] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Long Chen
- Department of Physics and ITPA, Xiamen University, Xiamen 361005, P. R. China
| | - Holger Merlitz
- Department of Physics and ITPA, Xiamen University, Xiamen 361005, P. R. China
- Leibniz-Institut für Polymerforschung Dresden, 01069 Dresden, Germany
| | - Su-zhen He
- Department of Physics and ITPA, Xiamen University, Xiamen 361005, P. R. China
- Department of Electronic Engineering, Putian University, Putian 351100, P. R. China
| | - Chen-Xu Wu
- Department of Physics and ITPA, Xiamen University, Xiamen 361005, P. R. China
| | - Jens-Uwe Sommer
- Leibniz-Institut für Polymerforschung Dresden, 01069 Dresden, Germany
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Almusallam AS, Sholl DS. Brownian dynamics simulations of copolymer-stabilized nanoparticles in the presence of an oil–water interface. J Colloid Interface Sci 2007; 313:345-52. [PMID: 17509608 DOI: 10.1016/j.jcis.2007.04.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2007] [Revised: 03/30/2007] [Accepted: 04/07/2007] [Indexed: 10/23/2022]
Abstract
We describe predictions of properties of copolymer-stabilized nanoparticles in the presence of an oil-water interface based on Brownian dynamics simulations. These simulations provide information regarding the equilibrium and diffusion properties of the stabilized particles. The hydrophilic part of the copolymer is modeled as a polyelectrolyte and is described at the Debye-Hückel level. Both block and random copolymers are considered. The surface area of particles at the fluid interface and the diffusion properties of the particles give some guidance into the copolymer architectures that may be most useful for stabilizing nanoparticles at fluid interfaces. We find based on our results that a conservative recommendation to enhance transportability in a water phase and attachment to an oil-water interface would be to design nanoparticles with a random copolymer attached to them.
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Zherenkova LV, Komarov PV, Khalatur PG. Effective intramolecular interactions in weakly charged polyelectrolytes: Relation to structural behavior of solution. POLYMER SCIENCE SERIES A 2006. [DOI: 10.1134/s0965545x06080128] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Li F, Balastre M, Schorr P, Argillier JF, Yang J, Mays JW, Tirrell M. Differences between tethered polyelectrolyte chains on bare mica and hydrophobically modified mica. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:4084-91. [PMID: 16618148 DOI: 10.1021/la052293l] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
This study investigates the structures of layers of amphiphilic diblock copolymers of poly(t-butyl styrene)-poly(styrene sulfonate) (PtBS-PSS) adsorbed on both the bare mica surface (hydrophilic) and an octadecyltriethoxysilane (OTE)-modified mica surface (hydrophobic). When the surface is rendered hydrophobic, the nonsoluble block exhibits stronger interaction with the surface and higher adsorbed masses are achieved. Interaction forces between two such adsorbed layers on both substrates were measured using the surface forces apparatus. The effect of salt concentration (Cs) and molecular weight (N) on the height of the self-assembled layers (L0) was examined in each case. The resulting scaling relationship is in good agreement with predictions of the brush model, L0 proportional to N(1.0) in the low-salt limit and L0N(-1) proportional to (Cs/sigma)(-0.32) in the salted regime, when adsorption takes place onto the hydrophobized mica surface. For adsorption on the bare mica surface, L0N(-0.7) proportional, variant Cs(-0.17) agrees with the scaling prediction of the sparse tethering model. The results suggest that, on the hydrophilic bare mica surface, the adsorbed amount is not high enough to form a brush structure and only very little intermolecular stretching of the tethered chains occurs; in contrast, the presence of the hydrophobic OTE layer increases the tethering density such that the polyelectrolyte chains adopt a brush conformation.
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Affiliation(s)
- Feng Li
- Department of Chemical Engineering and the Materials Research Laboratory, University of California at Santa Barbara, Santa Barbara, California 93106, USA
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Yin DW, Yan Q, de Pablo JJ. Molecular dynamics simulation of discontinuous volume phase transitions in highly-charged crosslinked polyelectrolyte networks with explicit counterions in good solvent. J Chem Phys 2005; 123:174909. [PMID: 16375571 DOI: 10.1063/1.2102827] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The volumetric properties of highly-charged defect-free polyelectrolyte networks with tetrafunctional crosslinks are studied through molecular dynamics simulations in the canonical ensemble. The network backbone monomers, which are monovalent, and the counterions, which are mono-, di-, or trivalent, are modeled explicitly in the simulations, but the solvent is treated implicitly as a dielectric medium of good solvation quality. The osmotic pressure of the network-solvent system is found to depend greatly on the strength of electrostatic interactions. Discontinuous volume phase transitions are observed when the electrostatic interactions are strong, and the onset of these transitions shifts to higher solvent dielectricity as the counterion valency increases. The roles of the various virial contributions to the osmotic pressure are examined. The network elasticity entropy is found to behave nearly classically. As the network contracts and collapses with increasing strength of electrostatic interactions, the loss of counterion entropy leads to increased counterion osmotic pressure contributions via two mechanisms. The reduction in available configurational space increases the counterion translational entropy contribution to the ideal part of the osmotic pressure, and the greater number of counterion-monomer contacts formed due to counterion condensation and confinement increases the counterion excluded-volume entropy contribution to the excess part of the osmotic pressure. These observations contrast the decrease in the single ideal-gas-like counterion translational entropy contribution to the osmotic pressure predicted by the counterion condensation-charge renormalization theory. An accompanying decrease in the total electrostatic energy balances the loss of counterion excluded-volume entropy as the polyelectrolyte networks collapse in low-dielectric solvents. This interplay between the electrostatic energy and the counterion excluded-volume entropy appears to be responsible for the discontinuous volume phase transitions that are observed in polyelectrolyte networks. The structure of the polyelectrolyte network is also found to be affine in the swollen state, with constituent chains nearly fully extended, and nonaffine in the collapsed state, with the chains adopting a Gaussian conformation.
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Affiliation(s)
- De-Wei Yin
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706-1691, USA
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Dobrynin AV. Electrostatic Persistence Length of Semiflexible and Flexible Polyelectrolytes. Macromolecules 2005. [DOI: 10.1021/ma051353r] [Citation(s) in RCA: 103] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andrey V. Dobrynin
- Polymer Program, Institute of Materials Science and Department of Physics, University of Connecticut, Storrs, Connecticut 06269-3136
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Dobrynin AV, Deshkovski A, Rubinstein M. Adsorption of Polyelectrolytes at Oppositely Charged Surfaces. Macromolecules 2001. [DOI: 10.1021/ma0013713] [Citation(s) in RCA: 156] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andrey V. Dobrynin
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina, 27599-3290
| | - Alexander Deshkovski
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina, 27599-3290
| | - Michael Rubinstein
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina, 27599-3290
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Cannavacciuolo L, Sommer C, Pedersen JS, Schurtenberger P. Size, flexibility, and scattering functions of semiflexible polyelectrolytes with excluded volume effects: monte carlo simulations and neutron scattering experiments. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 2000; 62:5409-19. [PMID: 11089104 DOI: 10.1103/physreve.62.5409] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2000] [Indexed: 04/15/2023]
Abstract
We present a systematic Monte Carlo study of the scattering function S(q) of semiflexible polyelectrolytes at infinite dilution, in solutions with different concentrations of added salt. In the spirit of a theoretical description of polyelectrolytes in terms of the equivalent parameters, namely, persistence length and excluded volume interactions, we used a modified wormlike chain model, in which the monomers are represented by charged hard spheres placed at distance a. The electrostatic interactions are approximated by a Debye-Huckel potential. We show that the scattering function is quantitatively described by that of uncharged wormlike chains with excluded volume effects provided that an electrostatic contribution is added to the persistence length. In addition we have studied the expansion of the radius of gyration and of the end-to-end distance. The results are in agreement with the picture outlined in the Odijk-Skolnick-Fixman theory, in which the behavior of charged polymers is described only in terms of increasing local rigidity and excluded volume effects. Moreover, the Monte Carlo data are found to be in very good agreement with experimental scattering measurements with equilibrium polyelectrolytes, i.e., giant wormlike micelles formed in mixtures of nonionic and ionic surfactants in dilute aqueous solution, with added salt.
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Affiliation(s)
- L Cannavacciuolo
- Institut fur Polymere, Eidgenossische Technische Hochschule, CH-8092 Zurich, Switzerland
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11
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Shew CY, Yethiraj A. Monte Carlo simulations and self-consistent integral equation theory for polyelectrolyte solutions. J Chem Phys 1999. [DOI: 10.1063/1.478439] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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12
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Aseyev VO, Tenhu H, Klenin SI. Contraction of a Polyelectrolyte upon Dilution. Light-Scattering Studies on a Polycation in Saltless Water−Acetone Mixtures. Macromolecules 1998. [DOI: 10.1021/ma980552q] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vladimir O. Aseyev
- Laboratory of Polymer Chemistry, PB 55, FIN-00014 HY, University of Helsinki, Finland
| | - Heikki Tenhu
- Laboratory of Polymer Chemistry, PB 55, FIN-00014 HY, University of Helsinki, Finland
| | - Stanislav I. Klenin
- Institute of Macromolecular Compounds, Russian Academy of Science, Bolshoi Prospect 31, 199004 St. Petersburg, Russia
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Affiliation(s)
| | - Thomas A. Vilgis
- Max-Planck-Institut für Polymerforschung, Postfach 3148, 55021 Mainz, Germany
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